Sr. Software Engineer TS​/SCI Polygraph HANOVER Security Clearance

Position: Sr. Software Engineer TS/SCI Polygraph HANOVER with Security Clearance
Location: Hanover

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- Description Leidos has a new and exciting opportunity for a Software Engineer in our National Security Sector's (NSS) Cyber & Analytics Business Area (CABA).  Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more.  

Join us and make a difference in National Security!  The Software Engineer will support the design, development, testing, deployment, and maintenance of a Data Dictionary capability that provides metadata specification, storage, and access services. This system includes a Java/Spring-based backend, RESTful APIs, and a web-based user interface. The engineer will work independently to implement features, contribute to architectural decisions, and support full lifecycle software delivery within a collaborative Agile environment.

Responsibilities Primary responsibilities include:
* Develop, maintain, and enhance Java/Spring applications supporting:
* A web-based user interface for creating and managing metadata specifications, including attributes and valid values
* A database solution for storing specifications
* RESTful services enabling programmatic access to specifications
* Design and implement backend services and APIs
* Contribute to system architecture, technical design, and engineering best practices
* Develop and maintain database schemas, queries, and integrations
* Support CI/CD pipelines, deployment activities, and operational readiness
* Collaborate with cross-functional teams, stakeholders, and system integrators
* Mentor junior engineers and provide technical guidance

Required Qualifications
* Active TS/SCI clearance with Polygraph up front (no sponsorship available)
* Bachelor’s degree in Computer Engineering, Computer Science, or a related technical field
* Four (4) additional years of software engineering experience may be substituted for a bachelor’s degree, for a total of twelve (12) years of experience
* Minimum of eight (8) years of software engineering experience
* Minimum of three (3) years of experience in SIGINT, IA, or IT domains
* Minimum of three (3) years of experience with modern Java and Spring/Spring Boot development
* Experience developing RESTful APIs and JSON-based web services
* Strong SQL and relational database experience, including PostgreSQL or equivalent technologies
* Experience working in Linux development environments Desired Qualifications
* Java/J2EE application development
* Spring Framework and Spring Boot
* PostgreSQL and SQL database design
* User interface design, development, and testing
* REST, XML, and JSON web services
* Linux-based systems
* Docker and Kubernetes
* CI/CD pipelines and deployment automation
* Task tracking and ticketing systems such as JIRA or Redmine
* Clear, professional communication of technical ideas, status, and issues to both peers and management At Leidos, the opportunities are boundless. We challenge our staff with interesting assignments that allow them to thrive professionally and personally. For us, helping you grow your career is good business. We look forward to learning more about you – apply today If you're looking for comfort, keep scrolling.

At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares. Original Posting:
June 11, 2026 For U.S. Positions:
While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above. Pay Range:
Pay Range $ - $ The Leidos…